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Data Dissemination



The s2d ENSEMBLES global hindcasts are publicly disseminated using two options: 1) a MARS-based server and 2) a server using OPeNDAP technology. Please, check the conditions of use detailed below.

Warning: Please check list of "Known problems with the data" at the end of this page before downloading data.

The systems have been conceived and developed to help project partners, external scientists and users to access the ENSEMBLES seasonal-to-decadal data in the most efficient way for their specific requirements. While the MARS-based server offers a quick and easy way to interactively download the data, the OPeNDAP server provides external clients (software such as IDL or scripts run remotely) with access to the dataset without human intervention. Users are reminded that access to the full-resolution atmospheric data is available through MARS, the use of which requires an ECMWF member-state account.

All atmospheric data are interpolated on a regular grid with 2.5 degrees resolution. The ocean data are all in a 1 degree common grid. A large amount of variables is available.

Before downloading the data, please check the list of manuscripts about the Stream 2 experiment submitted or in preparation by the ENSEMBLES partners.

To cite the Stream 1 experiment, please refer to Doblas-Reyes, F.J., A. Weisheimer, M. Déqué, N. Keenlyside, M. McVean, J.M. Murphy, P. Rogel, D. Smith and T.N. Palmer (2009). Addressing model uncertainty in seasonal and annual dynamical seasonal forecasts. Quart. J. R. Meteorol. Soc, 135, 1538-1559.

To site the Stream 2 experiment, please refer to Weisheimer, A., F.J. Doblas-Reyes, T.N. Palmer, A. Alessandri, A. Arribas, M. Deque, N. Keenlyside, M. MacVean, A. Navarra and P. Rogel (2009). ENSEMBLES - a new multi-model ensemble for seasonal-to-annual predictions: Skill and progress beyond DEMETER in forecasting tropical Pacific SSTs. Geophys. Res. Lett., 36, L21711, doi:10.1029/2009GL040896.

  • OPeNDAP server
  • The tool is an aggregation server (also known as THREDDS) that collects all the files (either daily data or monthly means) into a single dataset. Although many OPeNDAP servers act as a tool to aggregate remote datasets, this one only disseminates the data archived locally in NetCDF format.

    Suggestions for access to and visualization of the data as well as a description of the NetCDF format used can be found here.

    The individual NetCDF files can also be downloaded. A list of the code numbers corresponding to each variable is available here.

    At present, the server disseminates

    • Atmospheric and ocean data from the seasonal and annual hindcasts of the ENSEMBLES Stream 1 experiment . The atmospheric variables are available for the five models contributing to the multi-model (ECMWF's IFS/HOPE, UK Met Office's GloSea and DePreSys, Météo-France's ARPEGE/OPA and IfM Kiel's ECHAM5/OM1, 9 members each), ECMWF's IFS/HOPE with the CASBS stochastic physics scheme (9 members) and the HadCM3 perturbed parameter ensemble (8 different versions, 1 member each). The ocean variables are only available for the ECMWF's IFS/HOPE without and with CASBS.
    • Atmospheric and ocean data from the seasonal, annual and decadal hindcasts of the ENSEMBLES Stream 2 experiment. Check this link to follow the progress in the availability of the data sets from this experiment. The atmospheric variables are available for the five models contributing to the multi-model (ECMWF's IFS/HOPE, UK Met Office's HadGEM2, Météo-France's ARPEGE/OPA, INGV's ECHAM5/OPA and IfM Kiel's ECHAM5/OM1, with 9 members each) and the HadCM3 perturbed parameter ensemble (9 different versions, 1 member each).
    • ECMWF ocean analysis data in the common and native ocean grid.
    • IfM-GEOMAR ocean analysis data in the common grid.
    • CERFACS ocean analysis data in the common grid.
    • INGV ocean analysis data in the common grid.
    • Met Office ocean analysis data in the common grid.
    • Atmospheric monthly mean data from the DEMETER multi-model hindcasts.

  • MARS-based server
  • Using the technology developed in the DEMETER project, a server based on the ECMWF MARS system has been installed by the Operations Department to distribute atmospheric s2d ENSEMBLES data. Note that you will have to register the first time you access this system.

    There are two separate interfaces, one for seasonal and annual Stream 1 hindcasts and another one for the seasonal and annual Stream 2 hindcasts.

    The server is user friendly, interactive and provides the data in GRIB format. Specific areas can be selected and a tool is made available to visualize the selected fields. Bear in mind that when some data are not available, the system will mask the corresponding option. This masking might change in the future as more data become available.

    Note that the system is intended for interactive access and the number of fields to be retrieved in one request is limited. Users with high demands of data or using scripts are strongly encouraged to employ the OPeNDAP server.

  • Conditions of use
    1. Data available from this server is provided over the internet without charge for use in research and education work. Commercial use of the data is not permitted.
    2. Research is understood as any project organised by a university, scientific institute or similar (private or institutional), for non-commercial research purposes only. A necessary condition for the recognition of non-commercial purposes is that all the results obtained are openly available at delivery costs only, without any delay linked to commercial objectives, and that the research itself is submitted for open publication.
    3. Users of the ENSEMBLES data must publish their results obtained using these data in the open literature. Users are expected to submit a copy of their results based on these data to ECMWF. Users should help improve the quality of the data and its delivery by giving feedback where appropriate.
    4. Although every care has been taken in preparing and testing the data, ECMWF cannot guarantee that the data are correct in all circumstances; neither does ECMWF accept any liability whatsoever for any error or omission in the data, or for any loss or damage arising from its use.
    5. Data must not be supplied as a whole or in part to any third party outside your organisation.
    6. Any data user within your organisation automatically agrees to abide by the conditions under which the data have been provided.
    7. All data use, however small, derived or embedded, must be acknowledged. Articles, papers, or written scientific works of any form, based in whole or in part on ENSEMBLES data, will include the following acknowledgement: "The ENSEMBLES data used in this work was funded by the EU FP6 Integrated Project ENSEMBLES (Contract number 505539) whose support is gratefully acknowledged." Subsequent references can refer to the data in terms such as "ENSEMBLES data", "the ENSEMBLES dataset" or by the data's generic name which is from the "ENSEMBLES data archive".
  • Known problems with the data

This is a list of known problems with the archived data that were reported to us. Please check the list carefully before downloading the data.

  • INGV-CMCC: The 2m Tmin and Tmax variables were systematically interchanged during archival. That is, Tmin corresponds to GRIB code 201 instead of 202. Conversely, Tmax corresponds to code 202 instead of 201. (26 January 2010)

The problem has been solved for Tmin and Tmax on the THREDDS data server by correcting the NetCDF headers. However, the two variables have not been corrected, and thus are still swapped, in the GRIB files archived in MARS.
(10 March 2010)


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